<template>
    <el-breadcrumb class="app-breadcrumb" separator-class="el-icon-arrow-right">
        <transition-group name="breadcrumb">
            <el-breadcrumb-item v-for="(item, index) in breadcrumbs" :key="item.path">
                <span v-if="item.redirect === 'noredirect' || index === breadcrumbs.length - 1" class="no-redirect">{{ item.meta.title }}</span>
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script lang="ts">
import { defineComponent, onBeforeMount, reactive, toRefs, watch } from 'vue'
import { useRoute, RouteLocationMatched } from 'vue-router'
import { compile } from 'path-to-regexp'
import router from '@/router'
export default defineComponent({
    setup() {
        const currentRoute = useRoute()
        const pathCompile = (path: string) => {
            const { params } = currentRoute
            const toPath = compile(path)
            return toPath(params)
        }

        const state = reactive({
            breadcrumbs: [] as Array<RouteLocationMatched>,
            getBreadcrumb: () => {
                let matched = currentRoute.matched.filter((item) => item.meta && item.meta.title)
                const frist = matched[0]
                if (!state.isDashboard(frist)) {
                    matched = [{ path: '/welcome', meta: { title: '管理后台' } } as any].concat(matched)
                }
                state.breadcrumbs = matched.filter((item) => {
                    return item.meta && item.meta.title && item.meta.breadcrumb !== false
                })
            },
            isDashboard(route: RouteLocationMatched) {
                const name = route && route.name
                if (!name) {
                    return false
                }
                return name.toString().trim().toLocaleLowerCase() === 'welcome'.toLocaleLowerCase()
            },
            handleLink(item: any) {
                const { redirect, path } = item
                if (redirect) {
                    router.push(redirect).catch((err) => {
                        console.warn(err)
                    })
                    return
                }
                router.push(pathCompile(path)).catch((err) => {
                    console.warn(err)
                })
            }
        })

        watch(
            () => currentRoute.path,
            (path) => {
                if (path.startsWith('/redirect/')) {
                    return
                }
                state.getBreadcrumb()
            }
        )

        onBeforeMount(() => {
            state.getBreadcrumb()
        })

        return {
            ...toRefs(state)
        }
    }
})
</script>

<style lang="scss" scoped>
.el-breadcrumb__inner,
.el-breadcrumb__inner a {
    font-weight: 400 !important;
}

.app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 8px;

    .no-redirect {
        color: #97a8be;
        cursor: text;
    }
}
</style>
